Malicious PDF — malware analysis report

Static analysis result for SHA-256 912a57b86a6d7bf7…

MALICIOUS

PDF

69.4 KB Created: 2021-08-28 15:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: debed48fe1888b7b13824805567f392f SHA-1: ac6365e608de6c930876260e704cf409a4414a90 SHA-256: 912a57b86a6d7bf753b7b5cc714c3d97aaedbf5a27b691993133daabed2d7f10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=circumvent+meaning+in+tamil PDF link annotation
    • http://dblbtech.com/userfiles/file/92365863765.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pogoluvawuriri.pdfIn PDF document text
    • https://daismene.it/file/xulowufamo.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/pobanutubasubeb.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/robimaftlf5khgcq1h49r13imd/62349562017.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/a585e820a9e9192cd5381313e776ea8c/radoxivalavotonutoxo.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/jevuxopetuxapi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/l2mn6bvdpc25uocqv4hu9cth7c/37738746083.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xiwetuvojam.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/xebivodegave.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac3305c4e---71713343588.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/62ac5e17bbaa676a9ac750698bf57aa5/85430392338.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/kozozuk.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc8d0eeccd---safulavikovoj.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/zepemamirabusez.pdfIn PDF document text
    • http://usateatop.com/_upload/files/67487374923.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607997467c9a0---vudopaduxopapiniponalimu.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/duwuroxitawazu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160949c19d27c3---wuvepodorolozegodan.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/10659103313.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/misatexivatipojixek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA2 10480 bytes
SHA-256: aef28beb4c6ea126ac18946afd8b2b86b5aedaf4dd8452e25563edecba42ec57
font_01_sfnt_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 17104 bytes
SHA-256: 61281d7d66b16bfd350f40eeac9ca564bb380688323ab2be50d5d49e9bc25644
font_02_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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